Added motor code for forklift, and fixed analog and i2c code after testing.
Added analog.c for line following and linear pot
Most of the line following was copy-pasted from Colony 3. Still unsureabout prescaler, which used to be 2 for some reason but is now 64.
Added code for forklift AVR
twi.c and twi.h were taken from Arduino's library. forklift.c currentlyimplements i2c slave communication, but no motor control or sensor inputyet.